Central finance 1:n field value mapping

Dear all,

we are configuring Central finance value mapping through MDG framework and we are facing to an issue regarding this topic. We have two field values in source system that  should be mapped to 1 value in target. It is like this

Source                                            Target

Functional location XX

Cost element   11111                      Gl Account  323232

We have tried to see how to do it but honestly we are a little bit lost and not sure whether is possible without an enhancement.

Thanks a lot